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![Stephen Warren](/assets/img/avatar_default.png)
These commands may be used to determine the size of a file without actually reading the whole file content into memory. This may be used to determine if the file will fit into the memory buffer that will contain it. In particular, the DFU code will use it for this purpose in the next commit. Signed-off-by: Stephen Warren <swarren@nvidia.com>
234 lines
5.2 KiB
C
234 lines
5.2 KiB
C
/*
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* (C) Copyright 2011 - 2012 Samsung Electronics
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* EXT4 filesystem implementation in Uboot by
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* Uma Shankar <uma.shankar@samsung.com>
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* Manjunatha C Achar <a.manjunatha@samsung.com>
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*
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* ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
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* Ext4 read optimization taken from Open-Moko
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* Qi bootloader
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*
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* (C) Copyright 2004
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* esd gmbh <www.esd-electronics.com>
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* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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*
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* based on code from grub2 fs/ext2.c and fs/fshelp.c by
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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*
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* ext4write : Based on generic ext4 protocol.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <ext_common.h>
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#include <ext4fs.h>
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#include "ext4_common.h"
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int ext4fs_symlinknest;
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struct ext_filesystem ext_fs;
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struct ext_filesystem *get_fs(void)
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{
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return &ext_fs;
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}
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void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
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{
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if ((node != &ext4fs_root->diropen) && (node != currroot))
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free(node);
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}
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/*
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* Taken from openmoko-kernel mailing list: By Andy green
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* Optimized read file API : collects and defers contiguous sector
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* reads into one potentially more efficient larger sequential read action
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*/
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int ext4fs_read_file(struct ext2fs_node *node, int pos,
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unsigned int len, char *buf)
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{
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struct ext_filesystem *fs = get_fs();
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int i;
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lbaint_t blockcnt;
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int log2blksz = fs->dev_desc->log2blksz;
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int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
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int blocksize = (1 << (log2_fs_blocksize + log2blksz));
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unsigned int filesize = __le32_to_cpu(node->inode.size);
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lbaint_t previous_block_number = -1;
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lbaint_t delayed_start = 0;
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lbaint_t delayed_extent = 0;
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lbaint_t delayed_skipfirst = 0;
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lbaint_t delayed_next = 0;
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char *delayed_buf = NULL;
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short status;
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/* Adjust len so it we can't read past the end of the file. */
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if (len > filesize)
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len = filesize;
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blockcnt = ((len + pos) + blocksize - 1) / blocksize;
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for (i = pos / blocksize; i < blockcnt; i++) {
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lbaint_t blknr;
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int blockoff = pos % blocksize;
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int blockend = blocksize;
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int skipfirst = 0;
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blknr = read_allocated_block(&(node->inode), i);
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if (blknr < 0)
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return -1;
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blknr = blknr << log2_fs_blocksize;
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/* Last block. */
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if (i == blockcnt - 1) {
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blockend = (len + pos) % blocksize;
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/* The last portion is exactly blocksize. */
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if (!blockend)
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blockend = blocksize;
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}
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/* First block. */
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if (i == pos / blocksize) {
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skipfirst = blockoff;
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blockend -= skipfirst;
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}
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if (blknr) {
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int status;
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if (previous_block_number != -1) {
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if (delayed_next == blknr) {
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delayed_extent += blockend;
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delayed_next += blockend >> log2blksz;
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} else { /* spill */
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status = ext4fs_devread(delayed_start,
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delayed_skipfirst,
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delayed_extent,
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delayed_buf);
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if (status == 0)
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return -1;
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previous_block_number = blknr;
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delayed_start = blknr;
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delayed_extent = blockend;
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delayed_skipfirst = skipfirst;
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delayed_buf = buf;
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delayed_next = blknr +
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(blockend >> log2blksz);
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}
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} else {
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previous_block_number = blknr;
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delayed_start = blknr;
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delayed_extent = blockend;
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delayed_skipfirst = skipfirst;
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delayed_buf = buf;
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delayed_next = blknr +
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(blockend >> log2blksz);
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}
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} else {
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if (previous_block_number != -1) {
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/* spill */
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status = ext4fs_devread(delayed_start,
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delayed_skipfirst,
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delayed_extent,
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delayed_buf);
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if (status == 0)
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return -1;
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previous_block_number = -1;
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}
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memset(buf, 0, blocksize - skipfirst);
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}
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buf += blocksize - skipfirst;
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}
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if (previous_block_number != -1) {
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/* spill */
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status = ext4fs_devread(delayed_start,
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delayed_skipfirst, delayed_extent,
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delayed_buf);
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if (status == 0)
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return -1;
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previous_block_number = -1;
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}
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return len;
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}
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int ext4fs_ls(const char *dirname)
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{
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struct ext2fs_node *dirnode;
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int status;
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if (dirname == NULL)
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return 0;
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status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
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FILETYPE_DIRECTORY);
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if (status != 1) {
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printf("** Can not find directory. **\n");
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return 1;
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}
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ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
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ext4fs_free_node(dirnode, &ext4fs_root->diropen);
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return 0;
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}
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int ext4fs_exists(const char *filename)
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{
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int file_len;
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file_len = ext4fs_open(filename);
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return file_len >= 0;
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}
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int ext4fs_size(const char *filename)
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{
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return ext4fs_open(filename);
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}
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int ext4fs_read(char *buf, unsigned len)
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{
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if (ext4fs_root == NULL || ext4fs_file == NULL)
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return 0;
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return ext4fs_read_file(ext4fs_file, 0, len, buf);
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}
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int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
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disk_partition_t *fs_partition)
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{
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ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
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if (!ext4fs_mount(fs_partition->size)) {
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ext4fs_close();
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return -1;
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}
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return 0;
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}
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int ext4_read_file(const char *filename, void *buf, int offset, int len)
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{
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int file_len;
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int len_read;
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if (offset != 0) {
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printf("** Cannot support non-zero offset **\n");
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return -1;
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}
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file_len = ext4fs_open(filename);
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if (file_len < 0) {
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printf("** File not found %s **\n", filename);
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return -1;
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}
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if (len == 0)
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len = file_len;
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len_read = ext4fs_read(buf, len);
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return len_read;
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}
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